There is also a quick way to do this programmatically via the Dashboard API.
Go to Help > API Docs in Dashboard and look at the SSIDs section and see the "Update the attributes of an SSID" section.
Or in Python for example, you could update (or wipe) all 16 SSIDs in a few seconds by running a single for loop that might resemble something like this:
for x in range(0,15,1):
updatessid(apikey, networkid, x, name+str(x), enabled, authmode, encryptionmode, psk, suppressprint=False)
where x is your ssidnum.
If you've got Python installed do a "from meraki import meraki" and then "help (meraki.updatessid)" to get the syntax.